My two cents as far as this goes... I think putting in Red Mage and Summoner at least would be a bit redundant. The main canonical Red Mages we know of are listed under Black Mage (I don't think there are that many pure Red Mages outside of games with job class systems?), and same thing goes with Summoners (with the exception of Rydia, the other main canon summoners are also White Mages). Ninja might work separately but the only main named Ninja that has a vastly different personality from a Thief is Shadow, I think? And maybe some of the FFIV:TAY ninja characters but I wouldn't know.